EP0163517B1 - Manchette d'étanchéité renforcée de fibres pour joint universel - Google Patents

Manchette d'étanchéité renforcée de fibres pour joint universel Download PDF

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Publication number
EP0163517B1
EP0163517B1 EP85303746A EP85303746A EP0163517B1 EP 0163517 B1 EP0163517 B1 EP 0163517B1 EP 85303746 A EP85303746 A EP 85303746A EP 85303746 A EP85303746 A EP 85303746A EP 0163517 B1 EP0163517 B1 EP 0163517B1
Authority
EP
European Patent Office
Prior art keywords
boot
fibers
fiber
joint
dust boot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85303746A
Other languages
German (de)
English (en)
Other versions
EP0163517A1 (fr
Inventor
Hiroshi Yoshida
Rentaro Kato
Akira Takanaka
Shuji Ito
Naotaka Yamamoto
Masanobu Inoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of EP0163517A1 publication Critical patent/EP0163517A1/fr
Application granted granted Critical
Publication of EP0163517B1 publication Critical patent/EP0163517B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
    • F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
    • F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the cover
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows
    • F16J3/041—Non-metallic bellows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2200/00—Materials; Production methods therefor
    • F16D2200/006—Materials; Production methods therefor containing fibres or particles

Definitions

  • the present invention relates to an improvement in a dust boot for a mechanical joint such as a constant velocity joint in an automobile or other vehicle.
  • the dust boot serves to protect the joint from dirt and other material from the atmosphere and the road surface. It also prevents the outflow of lubricating grease used in the joint and sealed inside the boot.
  • Carbon-filled rubber has conventionally been used for manufacturing dust boots.
  • the incorporation of carbon in rubber increases the rigidity of the rubber.
  • the rigidity of the material used in a boot can be increased because high rigidity causes problems in molding.
  • a dust boot covering a joint is prone to expand and soften as a result of degradation of the material over time due to absorption of the lubricating grease.
  • the external diameter of the boot tends to expand due to the centrifugal force acting on it.
  • EP-A-61 320 discloses a dust boot for a constant velocity joint of a vehicle.
  • the boot is molded of a rubber material with a reinforcement of nylon polyester or aramid (see in particular page 2, line 22; page 4, line 2; page 6, lines 12-13 and page 7, line 14).
  • US-A-2 857 189 discloses a bushing of elastomer reinforced by glass fiber with a length of 6.35 mm and a diameter of 12 m (see in particular column 1, lines 29-48).
  • a dust boot for a joint in a vehicle the boot being molded of a rubber material having a reinforcement of fibers selected from the group consisting of synthetic inorganic fibers, synthetic organic fibers, and naturally occurring fibers; characterized in that the fibers consist of short fiber segments having a length of 2-6 mm and comprising 2-10% by weight of the rubber material.
  • the diameter of the fibers is preferably 30-50 ⁇ m.
  • the present boot is molded of rubber material which has been reinforced with short fibers.
  • the rubber material which can be used is not particularly limited. Any synthetic and/or natural rubber may be used.
  • the fibers suitable for incorporating into the rubber material are synthetic inorganic fibers such as carbon fibers; synthetic organic fibers such as polyester, nylon, or vinylon; and natural fibers such as jute.
  • the fibers may be incorporated into the rubber material by any method provided that the fibers are uniformly distributed therein.
  • the boot may be molded by any known conventional molding method, in particular a method using a metal mold.
  • the shape of the boot varies depending on the type of joint it protects.
  • the boot may be a straight type or bellows type propeller shaft dust boot, a tie rod end boot (for a rack and pinion steering wheel), or a ball joint boot.
  • a straight type boot made as herein described does not soften upon prolonged contact with lubricating grease, does not become deformed as a result of rotation, and does not expand under high speed rotation. Its durability is also improved because it has a high resistance to abrasion.
  • a bellows type boot made as herein described also saves space in that less clearance is required between the boot and adjacent parts of a vehicle.
  • a tie rod end boot made as herein described is not subject to problems such as drooping because it is highly rigid. It also presents a design advantage in that less clearance is required.
  • a ball joint boot made as herein described can be subject to a large angle of torsion without causing the sealing lip of the boot to become separated from the surface of the joint. In addition, this boot is not subject to abrasion due to vertical rocking of the joint.
  • the boot is not limited to the embodiments specifically described.
  • a preferred embodiment is a boot for a constant velocity joint.
  • An example of a boot for a constant velocity joint is described below with reference to the drawings.
  • an automobile 10 of the front wheel drive type is provided with drive shafts 1,1 for driving the front wheels (WF) of the automobile.
  • a constant-velocity joint 2 is provided in the drive shaft 1.
  • the constant-velocity joint 2 is covered with a boot 3 integrally formed in a bellows shape from a rubber material containing 2 to 10 wt.% of short fibers.
  • a boot for a constant velocity joint was made of a rubber material A as herein described and was compared to a similar boot made of a conventional material B. Table 1 shows the properties of these two boots.
  • the volume change (%) is the volume change of the boot material after it has been immersed in lubricating grease at 100°C for 70 hours. This volume change is a measure of the resistance of the boot to impregnation by the grease.
  • Table 1 shows that the 50% modulus, which is an indicator of rigidity in the region of practical application, increases appreciably in the material which contains a small amount (2 wt.%) of short fibers. At the same time, the viscosity, which is regarded as an indicator of relative ease in moldability, does not increase. Therefore, it is possible to make the boot 3 rigid without impairing its moldability.
  • the fiber segments have a length of no less than 2 mm and no more than 6 mm in order for the dust boot to have a proper rigidity and a proper moldability. It is also preferable that the diameter of the fiber be in the range 30-50 11m.
  • the fiber reinforced rubber (FRR) shows poor fatigue strength because the short fibers cannot be uniformly dispersed.
  • the fiber reinforcing effect is poor because it is easy for the fiber to cut at the molding.
  • Table 2 shows the volume expansion at points a, b, c, d, e and f of the boot of the shape shown in Fig. 3 for a boot made of material A as described herein, and for a boot made of a conventional material B.
  • This volume expansion is measured with the boot 3 inclined by ⁇ °, as shown in Fig. 3, that is, by 5° according to the embodiment, in an atmosphere at 70°C and with an engine speed of 1,700 r.p.m.
  • the materials I, II and III in Table 2 contain short natural jute fibers in proportions of 2 wt.%, 5 wt.% and 10 wt.%, respectively.
  • the resistance of the new material A to impregnation by lubricating grease is high, and as a result, its expansion due to grease absorption is low, as evident from Table 2. Therefore, it is possible to reduce the clearance between the boot and adjacent parts of the vehicle. This is advantageous in the design of space layout in the vicinity of the boot.
  • the material A is highly resistant to impregnation by lubricating grease, it is possible to reduce the thickness of the wall of the boot. As a result, the weight of the boot is advantageously reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Diaphragms And Bellows (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Sealing Devices (AREA)

Claims (3)

1. Machon d'étanchéité (3) pour joint universel d'un véhicule, le manchon (3) étant réalisé par moulage d'un matériau caoutchouteux renforcé par des fibres sélectionnées dans le groupe consitué par des fibres inorganiques synthétiques, des fibres organiques synthétiques, et des fibres naturelles; caractérisé en ce que les fibres sont constituées de segments de fibres courts d'une longueur de 2-6 mm et comprenant 2-10% en poids du matériau caoutchouteux.
2. Manchon d'étanchéité (3) selon la revendication 1, caractérisé en ce que la fibre a un diamètre de 30-50 µm.
3. Manchon d'étanchéité (3) selon la revendication 1 ou 2, caractérisé en ce que le manchon (3) est un manchon en forme de soufflet (3) pour joint à vitesse constante (2).
EP85303746A 1984-05-29 1985-05-29 Manchette d'étanchéité renforcée de fibres pour joint universel Expired EP0163517B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP109237/84 1984-05-29
JP59109237A JPS6110170A (ja) 1984-05-29 1984-05-29 等速ジヨイント用ブ−ツ

Publications (2)

Publication Number Publication Date
EP0163517A1 EP0163517A1 (fr) 1985-12-04
EP0163517B1 true EP0163517B1 (fr) 1988-05-04

Family

ID=14505086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85303746A Expired EP0163517B1 (fr) 1984-05-29 1985-05-29 Manchette d'étanchéité renforcée de fibres pour joint universel

Country Status (4)

Country Link
EP (1) EP0163517B1 (fr)
JP (1) JPS6110170A (fr)
CA (1) CA1244201A (fr)
DE (1) DE3562514D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030070242A (ko) * 2002-02-21 2003-08-29 엄재원 차량용 부트 및 상기 부트의 제조방법
US20050051972A1 (en) * 2003-09-04 2005-03-10 Wang Shen-Ling Allen Constant velocity joint assembly and sealing boot
US20050129890A1 (en) * 2004-08-05 2005-06-16 Wang Shen-Ling A. Automotive driveline components manufactured of hydrogenated nitrile butadiene rubber material

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922431A (en) * 1929-06-29 1933-08-15 Inland Mfg Co Flexible boot for universal joints
US2755643A (en) * 1950-07-05 1956-07-24 Wildhaber Ernest Flexible seal for universal joints
US2857189A (en) * 1955-01-14 1958-10-21 Rolls Royce Bushing of reinforced elastomer and method of manufacture
FR1160498A (fr) * 1956-11-08 1958-07-16 Lubrepa Perfectionnements apportés aux organes souples du genre des soufflets élastiques, notamment hélicoïdaux, et à leurs procédés de fabrication
JPS5139705Y2 (fr) * 1972-06-26 1976-09-29
AT340209B (de) * 1975-04-07 1977-12-12 Taurus Gumiipari Vallalat Rollbalg zu luftfedern
DE2904521A1 (de) * 1979-02-07 1980-08-28 Continental Gummi Werke Ag Rollbalg fuer fahrzeug-luftfederungen
BR8201276A (pt) * 1981-03-20 1983-01-18 Gates Rubber Co Protetor flexivel corrugado molde conjugado para produzir pares de protetores

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
H. Saechtling: "Kunststoff-Taschenbuch", 20th edition, Carl Hanser Verlag München-Wien, 1977, page 318. *

Also Published As

Publication number Publication date
DE3562514D1 (en) 1988-06-09
JPS6110170A (ja) 1986-01-17
EP0163517A1 (fr) 1985-12-04
CA1244201A (fr) 1988-11-08

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